My training is in New Testament studies and not history. However, I see a very close relationship between the two. I come at New Testament studies from the perspective of history.
How does one go about history in any other area? People who study Alexander the Great, the Han dynasty in China or the Napoleonic wars all go about it the same way. They look at the primary sources and examine the other historical forces surrounding those events.
When I study the New Testament, I do it the same way. I look at the New Testament texts as historical documents. I don’t mean looking at them as inerrant and inspired religious Scripture. I have Christian faith but I come at the New Testament as a historian first.
I then look at the surrounding context, including Hellenism, the Roman empire and early Judaism. I look at both the events that are described and what the texts say about the authors. This is exactly what historians do with other events.
That is not to say that New Testament studies is fully the same as other historical endeavours. Many New Testament scholars (including me) have religious beliefs and introduce theological ideas into the process. A historian of 19th century German philosophy may be inspired by the ideas they encounter but not in the same way as a New Testament scholar with Christian faith.
My basic conclusion is that New Testament studies can be more than history but it is definitely not less.